package/xvisor: drop ARM32 without virtualization support

Support for old 32-bit ARM boards (i.e. ARMv5, ARMv6, ARMv7a) without
virtualization has been dropped since
https://github.com/xvisor/xvisor/commit/9fcd69692484e0f6aa5036c27196f55c797582c5
resulting in the following build failure since bump to version 0.3.1 in
commit c4f8b8968770ecbf6444a5921c6472f126717626:

*** Can't find default configuration "/home/giuliobenetti/autobuild/run/instance-3/output-1/build/xvisor-0.3.1/arch/arm/configs/generic-v6-defconfig"!

*** Can't find default configuration "/home/giuliobenetti/autobuild/run/instance-0/output-1/build/xvisor-0.3.1/arch/arm/configs/generic-v7-defconfig"!

As spotted by Thomas Petazzoni in
https://patchwork.ozlabs.org/project/buildroot/patch/20220125190650.107677-1-fontaine.fabrice@gmail.com,
"ARM32 cores that support the ARMv7ve instruction set are still
supported by Xvisor. This means that Cortex-A7, Cortex-A12, Cortex-A15
and Cortex-A17, which are all ARM32 cores, are still supported"

Fixes:
 - http://autobuild.buildroot.org/results/1211bf6ff10c75815fa3ac320532fab5fe649a2b
 - http://autobuild.buildroot.org/results/2bcbbb270df71d2489b7bc83e56c898c58cc90d2

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/xvisor/Config.in

@@ -1,9 +1,9 @@
 config BR2_PACKAGE_XVISOR_ARCH_SUPPORTS
 	bool
-	default y
+	default y if BR2_aarch64
+	default y if BR2_cortex_a7 || BR2_cortex_a12 || BR2_cortex_a15 || BR2_cortex_a17
+	default y if BR2_x86_64
 	depends on BR2_USE_MMU
-	depends on BR2_arm || BR2_aarch64 || BR2_x86_64
-	depends on !BR2_ARM_CPU_ARMV4 && !BR2_ARM_CPU_ARMV7M
 
 menuconfig BR2_PACKAGE_XVISOR
 	bool "xvisor"
@@ -32,9 +32,7 @@ endchoice
 
 config BR2_PACKAGE_XVISOR_DEFCONFIG
 	string "Defconfig name"
-	default "generic-v5" if BR2_ARM_CPU_ARMV5
-	default "generic-v6" if BR2_ARM_CPU_ARMV6
-	default "generic-v7" if BR2_ARM_CPU_ARMV7A
+	default "generic-v7-ve" if BR2_ARM_CPU_ARMV7A
 	default "generic-v8" if BR2_aarch64
 	default "x86_64_generic" if BR2_x86_64
 	depends on BR2_PACKAGE_XVISOR_USE_DEFCONFIG