intel/socket_mPGA604: Keep only model f2x

The only board left in the tree (aopen/dxplplusu) with
this socket is the slower of the mPGA604 variants with
FSB 533.

Change-Id: I04707a0dcb8f5b6235ead8c02ddfddfe7c3b8b1b
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/28116
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/cpu/intel/socket_mPGA604/Kconfig

@@ -6,8 +6,6 @@ if CPU_INTEL_SOCKET_MPGA604
 config SOCKET_SPECIFIC_OPTIONS # dummy
 	def_bool y
 	select CPU_INTEL_MODEL_F2X
-	select CPU_INTEL_MODEL_F3X
-	select CPU_INTEL_MODEL_F4X
 	select MMX
 	select SSE
 	select UDELAY_TSC

src/cpu/intel/socket_mPGA604/Makefile.inc

@@ -1,6 +1,4 @@
 subdirs-y += ../model_f2x
-subdirs-y += ../model_f3x
-subdirs-y += ../model_f4x
 subdirs-y += ../../x86/tsc
 subdirs-y += ../../x86/mtrr
 subdirs-y += ../../x86/lapic