mb/lenovo/x201: Remove dGPU PMH7 bits

The bits cleared by this have to do with dGPU power, which this
board lacks.

TESTED: x201 still boots.

Change-Id: I441743f76afc7bbbee930a1c8116035e85d94e52
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36911
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/lenovo/x201/romstage.c

@@ -54,9 +54,6 @@ static void set_fsb_frequency(void)
 
 void mainboard_pre_raminit(void)
 {
-	outb(0x50, 0x15ec);
-	outb(inb(0x15ee) & 0x70, 0x15ee);
-
 	set_fsb_frequency();
 }