deletion of clang_cflags & clang_asflags from Soong

Clang_cflags and clang_asflags are depecrated.
Set up BUILD_BROKEN flags so partners can bypass errors
from using them

Bug: 226636335
Test: m nothing & treehugger
Change-Id: Ic1d90b72decc4c6c1f7e6dda95a2c56ab2c26d86

android/variable.go

@@ -430,6 +430,8 @@ type productVariables struct {
 
 	ShippingApiLevel *string `json:",omitempty"`
 
+	BuildBrokenClangAsFlags            bool     `json:",omitempty"`
+	BuildBrokenClangCFlags             bool     `json:",omitempty"`
 	BuildBrokenClangProperty           bool     `json:",omitempty"`
 	BuildBrokenDepfile                 *bool    `json:",omitempty"`
 	BuildBrokenEnforceSyspropOwner     bool     `json:",omitempty"`