Use macro GBBOOT_CPORT instead of magic number
Use macro GBBOOT_CPORT instead of magic number

Use macro instead of magic number

Testing Done:   Build generates the same image
Bug Number:     Trivial
Review URL:     https://reviews.leaflabs.com/r/2656/
Reviewed by:    Eli Sennesh

Signed-off-by:  Jun Li <4a139eac5426aee89571cee0a0f52cc73d82e960@projectara.com>

projectara/bootrom,gregkh/bootrom