Update dell 3050 patch to patch 15 (pwm fix)

Use patchset 15 instead of 14:
config/coreboot/default/patches/0061-WIP-OptiPlex-3050-Micro-port.patch

Rebase the verb patch; patchset 15 modified the Makefile:
config/coreboot/default/patches/0064-dell-optiplex_3050-add-hda_verb.c.patch

We were using patchset 14 for the 3050 micro:
https://review.coreboot.org/c/coreboot/+/82053/14

Now we use patchset 15:
https://review.coreboot.org/c/coreboot/+/82053/15

Without this patch, the fans are always on a low setting, on
the Dell OptiPlex 3050 Micro, even under stress conditions. With
this patch, the fans change speed according to CPU temperature.

I had to rebase my verb patch, because Mate modified the Makefile
to add his sch5555 handler, on the same line where I add hda_verb.

Mate tells me he will merge my verb and vbt patches into a further
patchset later on. For now, I've simply rebased these patches on
top of Mate's newer work; I've told him he can use them in his port.

I'm probably going to now issue a new revision ROM image for
Libreboot 20241008, so that users can get this fix sooner.

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

config/coreboot/default/patches/0049-haswell-NRI-Add-pre-training-steps.patch

@@ -1,7 +1,7 @@
-From 19890277e3a0d411b016efbe1b54e511d4f36c0d Mon Sep 17 00:00:00 2001
+From 0f160dee563155e93422fc77c53251419043d4dc Mon Sep 17 00:00:00 2001
 From: Angel Pons <th3fanbus@gmail.com>
 Date: Sat, 7 May 2022 23:12:18 +0200
-Subject: [PATCH 07/17] haswell NRI: Add pre-training steps
+Subject: [PATCH 49/65] haswell NRI: Add pre-training steps
 
 Implement pre-training steps, which consist of enabling ECC I/O and
 filling the WDB (Write Data Buffer, stores test patterns) through a
@@ -388,5 +388,5 @@ index 4fc78a7f43..f8408e51a0 100644
  
  #define REUT_ch_SEQ_CFG(ch)			(0x48a8 + 8 * (ch))
 -- 
-2.39.2
+2.39.5