package: rtl826x-firmware: make package versions consistent

package: rtl826x-firmware: make package versions consistent

The two packages rtl826x-firmware and rtl826x-lp-firmware are built
from the same source, yet have 'VERSION=xxx' overrides that modify
the package name and metadata.  This causes issues with apk, as
it always selects the package with the higher version number (the
'-lp-' one), irrespective of which package is desired.

Remove the VERSION overrides and use the actual package version so
that apk can install the correct package.  The binary contents of
the packages remain unaffect, this only changes the package file
name and metadata related to versioning.

Before
  rtl826x-firmware-20221115.apk
  rtl826x-lp-firmware-20240729.apk

After
  rtl826x-firmware-2026.01.24~0cd4abe2-r4.apk
  rtl826x-lp-firmware-2026.01.24~0cd4abe2-r4.apk

Fixes: https://github.com/openwrt/openwrt/issues/24145
Signed-off-by: Eric Fahlgren <ericfahlgren@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/24201
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>