gma: Implement automatic CPU detection

In dynamic CPU configurations, Config.Detect_CPU() sets the CPU
variables according to the given PCI device id. In static confi-
gurations it does nothing.

We update the default configs to make use of this feature where
applicable. This should still give us full build-test coverage
while cutting the amount of tests in half.

Change-Id: I8ce31c867f97c8d6ef99ca096cb45f7719e78a19
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/libgfxinit/+/27138
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/configs/haswell b/configs/haswell
index 8c025da..8adaafc 100644
--- a/configs/haswell
+++ b/configs/haswell
@@ -1,6 +1,5 @@
+CONFIG_GFX_GMA_DYN_CPU		= y
 CONFIG_GFX_GMA_GENERATION	= Haswell
-CONFIG_GFX_GMA_CPU		= Haswell
-CONFIG_GFX_GMA_CPU_VARIANT	= Normal
 CONFIG_GFX_GMA_INTERNAL_PORT	= DP
 CONFIG_GFX_GMA_ANALOG_I2C_PORT	= PCH_DAC
 CONFIG_GFX_GMA_DEFAULT_MMIO	= 16\#e000_0000\#