xen/x86: remove "depends on !PV_SHIM_EXCLUSIVE"

Remove all "depends on !PV_SHIM_EXCLUSIVE" (also the functionally
equivalent "if !...") in Kconfig file, since negative dependancy will badly
affect allyesconfig. Although "if !PV_SHIM_EXCLUSIVE" for CONFIG_VGA is not
truly a dependency, setting PV_SHIM_EXCLUSIVE y still makes it unconfigurable.
So we remove it here too

Add "#CONFIG_xxx is not set" for above options in presets for x86 PV shim, as
the explicit declaration is to ephasize setting for the shim is different
from the general default.

Signed-off-by: Penny Zheng <Penny.Zheng@amd.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

xen/arch/x86/Kconfig

@@ -303,8 +303,6 @@ config PV_SHIM_EXCLUSIVE
 
 	  If unsure, say N.
 
-if !PV_SHIM_EXCLUSIVE
-
 config HYPERV_GUEST
 	bool "Hyper-V Guest"
 	select GUEST
@@ -313,8 +311,6 @@ config HYPERV_GUEST
 
 	  If unsure, say N.
 
-endif
-
 config REQUIRE_NX
 	bool "Require NX (No eXecute) support"
 	help

xen/arch/x86/hvm/Kconfig

@@ -1,6 +1,5 @@
 menuconfig HVM
 	bool "HVM support"
-	depends on !PV_SHIM_EXCLUSIVE
 	default !PV_SHIM
 	select COMPAT
 	select IOREQ_SERVER

xen/drivers/video/Kconfig

@@ -3,7 +3,7 @@ config VIDEO
 	bool
 
 config VGA
-	bool "VGA support" if !PV_SHIM_EXCLUSIVE
+	bool "VGA support"
 	select VIDEO
 	depends on X86
 	default y if !PV_SHIM_EXCLUSIVE