[S] Change in coreboot[main]: arch/riscv/pmp: Add print macro

[Arthur Heymans (Code Review)]

Attention is currently required from: Maximilian Brune, Philipp Hug, Ron Minnich.

Arthur Heymans has posted comments on this change by Maximilian Brune. ( https://review.coreboot.org/c/coreboot/+/83056?usp=email )

Change subject: arch/riscv/pmp: Add print macro
......................................................................

Patch Set 2:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/83056/comment/f2ff73cf_1676d6d1?usp... :
PS2, Line 9: This adds a printk macro in the PMP code to avoid all harts writing onto
           : the serial which causes crappy/broken output.
           : 
What is the problem exactly? Are spinlocks broken?