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/zynq_cse_nor_defconfig b/configs/zynq_cse_nor_defconfig
index 9f2b738..3155fe0 100644
--- a/configs/zynq_cse_nor_defconfig
+++ b/configs/zynq_cse_nor_defconfig
@@ -83,4 +83,5 @@
 CONFIG_ARM_DCC=y
 CONFIG_SYS_TIMER_COUNTS_DOWN=y
 # CONFIG_GZIP is not set
+# CONFIG_EFI_LOADER is not set
 # CONFIG_LMB is not set