The rtc-pt7c4338.ko was never upstream under this name, the driver was
removed from OpenWrt some years ago, remove the kmod-rtc-pt7c4338
package too.
Fixes: 74d00a8c3849 ("kernel: split patches folder up into backport, pending and hack folders")
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>