u-boot: gru: Disable INIT_SP_RELATIVE

Recently, gru boards were migrated to use common stack addresses with
U-Boot commit 5e7cd8a11995 ("rockchip: Use common bss and stack
addresses on RK3399") and commit 49f8131e5594 ("rockchip: rk3399-gru:
Use TPL with common bss and stack addresses"). This is done with the
ROCKCHIP_COMMON_STACK_ADDR config.

With POSITION_INDEPENDENT, INIT_SP_RELATIVE defaults to enabled as well.
However, ROCKCHIP_COMMON_STACK_ADDR selects HAS_CUSTOM_SYS_INIT_SP_ADDR,
which depends on INIT_SP_RELATIVE being disabled. So this results in a
configuration warning:

  WARNING: unmet direct dependencies detected for HAS_CUSTOM_SYS_INIT_SP_ADDR
    Depends on [n]: ARM [=y] && ARCH_KIRKWOOD [=n] || ARC [=n] || ARM [=y] && !INIT_SP_RELATIVE [=y] || MIPS [=n] || PPC [=n] || RISCV [=n]
    Selected by [y]:
    - ROCKCHIP_COMMON_STACK_ADDR [=y] && ARM [=y] && ARCH_ROCKCHIP [=y] && SPL_SHARES_INIT_SP_ADDR [=y]

I'm not sure if adhering to the Rockchip values means we can't be
position-independent. Disabling INIT_SP_RELATIVE still appears to keep
my kevin board working, so let's do that for now.

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

config/u-boot/gru_bob/config/default

@@ -54,8 +54,7 @@ CONFIG_ARM64=y
 CONFIG_ARM64_CRC32=y
 CONFIG_COUNTER_FREQUENCY=24000000
 CONFIG_POSITION_INDEPENDENT=y
-CONFIG_INIT_SP_RELATIVE=y
-CONFIG_SYS_INIT_SP_BSS_OFFSET=524288
+# CONFIG_INIT_SP_RELATIVE is not set
 CONFIG_LNX_KRNL_IMG_TEXT_OFFSET_BASE=0x18000000
 # CONFIG_DRIVER_GICV2 is not set
 # CONFIG_GIC_V3_ITS is not set

config/u-boot/gru_kevin/config/default

@@ -54,8 +54,7 @@ CONFIG_ARM64=y
 CONFIG_ARM64_CRC32=y
 CONFIG_COUNTER_FREQUENCY=24000000
 CONFIG_POSITION_INDEPENDENT=y
-CONFIG_INIT_SP_RELATIVE=y
-CONFIG_SYS_INIT_SP_BSS_OFFSET=524288
+# CONFIG_INIT_SP_RELATIVE is not set
 CONFIG_LNX_KRNL_IMG_TEXT_OFFSET_BASE=0x18000000
 # CONFIG_DRIVER_GICV2 is not set
 # CONFIG_GIC_V3_ITS is not set