soc/intel: Move soc_pch_pirq_init() to common code

List of changes:
1. Rename soc_pch_pirq_init() as pch_pirq_init() and
move into common block code.
2. Remove redundant LPC functions from SoC directory and
refer from block/lpc directory.

TEST=Able to build and boot hatch and tglrvp platform without seeing
any functional impact.

Change-Id: I856b5ca024e58fd14b4d1721f23d9516a283ebf8
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45809
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/skylake/lpc.c

@@ -74,7 +74,7 @@ void lpc_soc_init(struct device *dev)
 
 	/* Interrupt configuration */
 	pch_enable_ioapic();
-	soc_pch_pirq_init(dev);
+	pch_pirq_init();
 	setup_i8259();
 	i8259_configure_irq_trigger(9, 1);
 }