grub: only enable nvme if needed on a board

remove nvme support from the "default" grub tree

now there are three trees:

* default: no xhci or nvme patches
* nvme: contains nvme support
* xhci: contains xhci and nvme support

this is in case a bug like lbmk issue #216 ever occurs
again, as referenced before during lbmk audit 5

there is no indication that the nvme patch causes any
issues, but after previous experience i want to be sure

Signed-off-by: Leah Rowe <leah@libreboot.org>

config/grub/default/config/payload

@@ -54,7 +54,7 @@ if [ -f (cbfsdisk)/timeout.cfg ]; then
 else	
 	set timeout=5
 fi
-set grub_scan_disk="nvme ahci ata"
+set grub_scan_disk="ahci ata"
 if [ -f (cbfsdisk)/scan.cfg ]; then
 	source (cbfsdisk)/scan.cfg
 fi
@@ -87,17 +87,11 @@ function search_grub {
 		for part in 1 2 3 4 5 6 7 8 9 10 11 12; do
 			if [ "${1}" != "nvme" ]; then
 				try_user_config "(${1}${i},${part})"
-			else
-				# TODO: do we care about other namesapces
-				try_user_config "(nvme${i}n1,${part})"
 			fi
 		done
 		if [ "${1}" != "nvme" ]; then
 			# raw devices e.g. (ahci0) instead of (ahci0,1)
 			try_user_config "(${1}${i})"
-		else
-			# TODO: do we care about other namesapces
-			try_user_config "(nvme${i}n1)"
 		fi
 	done
 	echo # Insert newline
@@ -123,17 +117,11 @@ function search_isolinux {
 		for part in 1 2 3 4 5 6 7 8 9 10 11 12; do
 			if [ "${1}" != "nvme" ]; then
 				try_isolinux_config "(${1}${i},${part})"
-			else
-				# TODO: see above
-				try_isolinux_config "(nvme${i}n1,${part})"
 			fi
 		done
 		if [ "${1}" != "nvme" ]; then
 			# raw devices e.g. (usb0) instead of (usb0,1)
 			try_isolinux_config "(${1}${i})"
-		else
-			# TODO: do we care about other namesapces
-			try_isolinux_config "(nvme${i}n1)"
 		fi
 	done
 	echo # Insert newline
@@ -175,9 +163,6 @@ menuentry 'Load Operating System (incl. fully encrypted disks)  [o]' --hotkey='o
 					bootdev="${bootdev} (ahci${i},${part})"
 				elif [ "${grub_disk}" = "ata" ]; then
 					bootdev="${bootdev} (ata${i},${part})"
-				elif [ "${grub_disk}" = "nvme" ]; then
-					# TODO: do we care about other namesapces
-					bootdev="${bootdev} (nvme${i}n1,${part})"
 				fi
 			done
 		done
@@ -214,9 +199,6 @@ menuentry 'Search for GRUB/SYSLINUX/EXTLINUX/ISOLINUX on AHCI  [a]' --hotkey='a'
 menuentry 'Search for GRUB/SYSLINUX/EXTLINUX/ISOLINUX on ATA/IDE  [d]' --hotkey='d' {
 	search_bootcfg ata
 }
-menuentry 'Search for GRUB/SYSLINUX/EXTLINUX/ISOLINUX on NVMe  [e]' --hotkey='e' {
-	search_bootcfg nvme
-}
 if [ -f (cbfsdisk)/grub.cfg ]; then
 menuentry 'Load configuration (grub.cfg) in CBFS  [t]' --hotkey='t' {
 	set root='(cbfsdisk)'