src/soc/intel/apollolake/cpu.c: Set up local APIC

src/soc/intel/apollolake/cpu.c: Set up local APIC

Some Apollo Lake mainboards use SeaBIOS as payload. SeaBIOS requires the
initialization of the programmable interrupt controller (PIC) for
faultless operation. The PIC mode is need for USB support (e.g.
keyboard, memory stick) and for some Option ROMs (e.g. PXE ROM).
Therefore add setup_lapic() to configure the APIC.

Change-Id: I00b339ce1850729023db74da7f8845927a95dcc6
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/31802
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>