qualcommax: ipq50xx: load Linksys partition tables from SMEM

qualcommax: ipq50xx: load Linksys partition tables from SMEM

The partition table on Linksys devices with a Qualcomm AX IPQ SoC is
stored in SMEM. As such, load partition table from SMEM rather than
statically defining them in their respective device trees. This helps
generalize the base template and requires less maintenance.

Signed-off-by: George Moussalem <george.moussalem@outlook.com>
Link: https://github.com/openwrt/openwrt/pull/21038
Link: https://github.com/openwrt/openwrt/pull/21273
Signed-off-by: Robert Marko <robimarko@gmail.com>