Build VMDK and VDI images for x86

x86-generic is still marked as broken as fastd v16 doesn't work with uClibc on
x86. This will be fixed with fastd v17.

targets/x86-generic/config

 CONFIG_TARGET_x86=y
-CONFIG_X86_USE_GRUB2=y
-CONFIG_X86_VDI_IMAGES=y
-CONFIG_X86_VMDK_IMAGES=y
+CONFIG_VDI_IMAGES=y
+CONFIG_VMDK_IMAGES=y

targets/x86-generic/profiles.mk

-$(eval $(call GluonProfile,Generic))
+$(eval $(call GluonProfile,VDI,kmod-pcnet32))
+$(eval $(call GluonProfileFactorySuffix,VDI))
+$(eval $(call GluonProfileSysupgradeSuffix,VDI))
+$(eval $(call GluonProfileExtraSuffix,VDI,.vdi))
+$(eval $(call GluonModel,VDI,combined-squashfs,x86-virtualbox))
+
+$(eval $(call GluonProfile,VMDK,kmod-pcnet32))
+$(eval $(call GluonProfileFactorySuffix,VMDK))
+$(eval $(call GluonProfileSysupgradeSuffix,VMDK))
+$(eval $(call GluonProfileExtraSuffix,VMDK,.vmdk))
+$(eval $(call GluonModel,VMDK,combined-squashfs,x86-vmware))