EFR: Fix efr lock rpc build (#21772)

Build was running out of flash, disable show_qr_code.
diff --git a/examples/lock-app/efr32/with_pw_rpc.gni b/examples/lock-app/efr32/with_pw_rpc.gni
index c9650d4..f51b6ac 100644
--- a/examples/lock-app/efr32/with_pw_rpc.gni
+++ b/examples/lock-app/efr32/with_pw_rpc.gni
@@ -29,3 +29,4 @@
 
 # To fit in flash
 chip_detail_logging = false
+show_qr_code = false