pldmfw: Select CRC32 when PLDMFW is selected

pldmfw calls crc32 code and depends on it being enabled, else
there is a link error as follows. So PLDMFW should select CRC32.

  lib/pldmfw/pldmfw.o: In function `pldmfw_flash_image':
  pldmfw.c:(.text+0x70f): undefined reference to `crc32_le_base'

This problem was introduced by commit b826562 ("Add pldmfw library
for PLDM firmware update").

It manifests as of commit d69ea41 ("ice: implement device flash
update via devlink").

And is more likely to occur as of commit 9ad1917 ("lib/crc: remove
unnecessary prompt for CONFIG_CRC32 and drop 'default y'").

Found by chance while exercising builds based on tinyconfig.

Fixes: b826562 ("Add pldmfw library for PLDM firmware update")
Signed-off-by: Simon Horman <horms@kernel.org>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/20250613-pldmfw-crc32-v1-1-f3fad109eee6@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: horms

lib/Kconfig

@@ -716,6 +716,7 @@ config GENERIC_LIB_DEVMEM_IS_ALLOWED
 
 config PLDMFW
 	bool
+	select CRC32
 	default n
 
 config ASN1_ENCODER