Provide 32-bit and 64-bit Rust libs by default.

CC libraries which depend on Rust libraries get missing dependency
errors when building 32-bit variants dependent on Rust modules which
don't explicitly have "multilib: both" declared.

Because CC libraries use MultilibBoth by default, Rust should do the
same.

This also fixes a bug where the ARM32 toolchain incorrectly embedded
toolchain64Bit instead of toolchain32Bit.

Bug: 154730212
Test: Rust libraries provide both variants by default.
Change-Id: Ia545fe069d3c6b77c3d18f4f10267e2c72ee0bab

rust/config/arm_device.go

@@ -50,7 +50,7 @@ func init() {
 }
 
 type toolchainArm struct {
-	toolchain64Bit
+	toolchain32Bit
 	toolchainRustFlags string
 }