arch/x86: Remove more romcc leftovers

The sections .rom.* were for romcc and no longer used.
Some romcc comments were left behind when guards were removed.

Change-Id: I060ad7af2f03c67946f9796e625c072b887280c1
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37955
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/cpu/intel/fit/fit.S

@@ -8,7 +8,7 @@ fit_pointer:
 .long 0
 .previous
 
-.section ".rom.data", "a", @progbits
+.section .text
 .align 16
 .global fit_table
 .global fit_table_end