amx3-cm3: Use COMPATIBLE_MACHINE instead of COMPATIBLE_HOST

This represents it correctly in package arch as well

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Denys Dmytriyenko <denys@ti.com>

recipes-bsp/cm3-pm-firmware/amx3-cm3_git.bb

@@ -24,5 +24,5 @@ do_install() {
 }
 
 FILES_${PN} += "${base_libdir}/firmware"
-COMPATIBLE_HOST ?= "null"
-COMPATIBLE_HOST_ti-soc = "(.*)"
+
+COMPATIBLE_MACHINE = "(ti-soc)"