Add linux_musl arm+arm64

Add toolchains to support cross compiling to aarch64-linux-musl and
arm-linux-musleabihf.

Bug: 236052820
Test: build arm and arm64 musl sysroots
Change-Id: I47a9322929baff2492c6e8db989ece01fcbeb133
diff --git a/bazel/configurability.go b/bazel/configurability.go
index 7355ac7..0ab49eb 100644
--- a/bazel/configurability.go
+++ b/bazel/configurability.go
@@ -43,6 +43,8 @@
 	osArchDarwinX86_64      = "darwin_x86_64"
 	osArchLinuxX86          = "linux_glibc_x86"
 	osArchLinuxX86_64       = "linux_glibc_x86_64"
+	osArchLinuxMuslArm      = "linux_musl_arm"
+	osArchLinuxMuslArm64    = "linux_musl_arm64"
 	osArchLinuxMuslX86      = "linux_musl_x86"
 	osArchLinuxMuslX86_64   = "linux_musl_x86_64"
 	osArchLinuxBionicArm64  = "linux_bionic_arm64"
@@ -101,6 +103,8 @@
 		osArchDarwinX86_64:         "//build/bazel/platforms/os_arch:darwin_x86_64",
 		osArchLinuxX86:             "//build/bazel/platforms/os_arch:linux_glibc_x86",
 		osArchLinuxX86_64:          "//build/bazel/platforms/os_arch:linux_glibc_x86_64",
+		osArchLinuxMuslArm:         "//build/bazel/platforms/os_arch:linux_musl_arm",
+		osArchLinuxMuslArm64:       "//build/bazel/platforms/os_arch:linux_musl_arm64",
 		osArchLinuxMuslX86:         "//build/bazel/platforms/os_arch:linux_musl_x86",
 		osArchLinuxMuslX86_64:      "//build/bazel/platforms/os_arch:linux_musl_x86_64",
 		osArchLinuxBionicArm64:     "//build/bazel/platforms/os_arch:linux_bionic_arm64",