[nrf fromlist] soc: nordic: enable west commands for nRF54L20 Enga cpuflpr

Enabled west flash and west erase for nRF54L20 PDK FLPR core.

Upstream PR #: 79355

Signed-off-by: Michał Stasiak <[email protected]>

Author: mstasiaknordic

soc/nordic/soc.yml

@@ -119,6 +119,7 @@ runners:
               - nrf54l15/cpuflpr
           - qualifiers:
               - nrf54l20/cpuapp
+              - nrf54l20/cpuflpr
           - qualifiers:
               - nrf54h20/cpuapp
               - nrf54h20/cpurad
@@ -181,6 +182,7 @@ runners:
               - nrf54l15/cpuflpr
           - qualifiers:
               - nrf54l20/cpuapp
+              - nrf54l20/cpuflpr
           - qualifiers:
               - nrf54h20/cpuapp
               - nrf54h20/cpurad