Don't pre-enable SATA AHCI in romstage.c

In a recent commit the SATA code of Panther Point / Cougar Point was
changed to enable AHCI mode depending on the device tree settings rather
than a hard code hidden in romstage.c. However, Emerald Lake 2 was not
fixed up accordingly.

Change-Id: I6c93f386509361e1ab5565b0e4d0e84f0ba282a2
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/995
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/mainboard/intel/emeraldlake2/romstage.c

@@ -132,9 +132,6 @@ static void early_pch_init(void)
 	reg8 = pci_read_config8(PCH_LPC_DEV, 0xa4);
 	reg8 &= ~(1 << 2);
 	pci_write_config8(PCH_LPC_DEV, 0xa4, reg8);
-
-	// SATA - enable AHCI
-	pci_write_config16(PCH_SATA_DEV, 0x90, 0x0060);
 }
 
 static void setup_sio_gpios(void)