[SerialICE] [patch] print (pseudo)code from serialice.lua

[Idwer Vollering]

Show the register size when qemu prints "PCI".
Print the corresponding pci_{read,write}_config_{8,16,32}() which can be
used for board specific code in both serialice and coreboot's romstage.c

Signed-off-by: Idwer Vollering