efi_loader: select BLK not depends on BLK

The BLK symbol is used both for "we have a block device subsystem
enabled" and "we need to utilize the block device library functions". In
the case of efi_loader, it is the case of "we need to utilize the block
device library", so select rather than depends on it. In turn, also
disable EFI_LOADER on platforms which did not have it on previously due
to a lack of block devices. They can enable it themselves if desired.

Acked-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/stm32mp25_defconfig b/configs/stm32mp25_defconfig
index 9fbd7eb..87038cc 100644
--- a/configs/stm32mp25_defconfig
+++ b/configs/stm32mp25_defconfig
@@ -48,6 +48,7 @@
 CONFIG_WDT_STM32MP=y
 CONFIG_WDT_ARM_SMC=y
 CONFIG_ERRNO_STR=y
+# CONFIG_EFI_LOADER is not set
 # CONFIG_LMB_USE_MAX_REGIONS is not set
 CONFIG_LMB_MEMORY_REGIONS=2
 CONFIG_LMB_RESERVED_REGIONS=32