lib: Remove the BOOTBLOCK_CUSTOM compile guard

This CL allows that everyone can use main() in lib/bootblock.c
even if you select CONFIG_BOOTBLOCK_CUSTOM. I also rename main
functions used in some soc/ to avoid the collision with the
main function defined at lib/bootblock.c.

Change-Id: I0575c9d1ce9dea9facfcc86760dff4deee9c1e29
Signed-off-by: Asami Doi <d0iasm.pub@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34250
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/lib/Makefile.inc

@@ -32,10 +32,7 @@ decompressor-y += memcmp.c
 decompressor-y += prog_ops.c
 decompressor-$(CONFIG_COLLECT_TIMESTAMPS) += timestamp.c
 
-ifneq ($(CONFIG_BOOTBLOCK_CUSTOM),y)
 bootblock-y += bootblock.c
-endif
-
 bootblock-y += prog_loaders.c
 bootblock-y += prog_ops.c
 bootblock-y += cbfs.c