Add buffer_end() function to common.h. This function returns a
pointer to the end of the buffer (exclusive).
This is needed by elogtool util. (See the next CL in the chain).
BUG=b:172210863
Change-Id: I380eecbc89c13f5fe5ab4c31d7a4fef97690a791
Signed-off-by: Ricardo Quesada <ricardoq@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56987
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
ff236ef832