soc/amd/stoneyridge/early_fch: use common lpc_early_init function

soc/amd/stoneyridge/early_fch: use common lpc_early_init function

The functionality of sb_enable_lpc is implemented in the common LPC
support code as lpc_enable_controller. This gets called by the common
lpc_early_init which also calls lpc_disable_decodes and lpc_set_spibase.
The lpc_set_spibase call was already done in bootblock_fch_early_init,
so the main change in code behavior is that now lpc_disable_decodes gets
called during early FCH initialization. The lpc_enable_port80 and
sb_lpc_decode calls after the lpc_early_init code will reenable some of
the decodes.

TEST=Successfully boots on google/liara, cbmem and dmesg logs look clean

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ia58a6f609fa149a6c09ed99f08bdc4f05eb56f96
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66841
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>