linux-firmware: amd64-microcode: Remove TARGET_x86 dependency

Build the amd64-microcode package on all architectures even if it only
makes sense to use it on x86. If the package build is done by a builder
not building for x86 it will not include the package otherwise.

Link: https://github.com/openwrt/openwrt/pull/16031
Signed-off-by: Hauke Mehrtens <[email protected]>

package/firmware/linux-firmware/amd.mk

@@ -1,4 +1,4 @@
-Package/amd64-microcode = $(call Package/firmware-default,AMD64 CPU microcode,@TARGET_x86,LICENSE.amd-ucode)
+Package/amd64-microcode = $(call Package/firmware-default,AMD64 CPU microcode,,LICENSE.amd-ucode)
 define Package/amd64-microcode/install
 	$(INSTALL_DIR) $(1)/lib/firmware/amd-ucode
 	$(CP) \