ipq807x: rename target to qualcommax

Currently, ipq807x only covers Qualcomm IPQ807x SoC-s.
However, Qualcomm also has IPQ60xx and IPQ50xx SoC-s under the AX WiSoC-s
and they share a lot of stuff with IPQ807x, especially IPQ60xx so to avoid
duplicating kernel patches and everything lets make a common target with
per SoC subtargets.

Start doing that by renaming ipq807x to qualcommax so that dependencies
on ipq807x target can be updated.

Signed-off-by: Robert Marko <robimarko@gmail.com>

.github/labeler.yml

@@ -41,8 +41,8 @@
   - "target/linux/ipq40xx/**"
 "target/ipq806x":
   - "target/linux/ipq806x/**"
-"target/ipq807x":
-  - "target/linux/ipq807x/**"
+"target/qualcommax":
+  - "target/linux/qualcommax/**"
 "target/kirkwood":
   - "target/linux/kirkwood/**"
   - "package/boot/uboot-kirkwood/**"