staging: pi433: fix CamelCase for flag enum

Fixes checkpatch warnings:

  CHECK: Avoid CamelCase: <modeSwitchCompleted>
  CHECK: Avoid CamelCase: <readyToReceive>
  CHECK: Avoid CamelCase: <readyToSend>
  CHECK: Avoid CamelCase: <pllLocked>
  CHECK: Avoid CamelCase: <rssiExceededThreshold>
  CHECK: Avoid CamelCase: <syncAddressMatch>
  CHECK: Avoid CamelCase: <packetSent>
  CHECK: Avoid CamelCase: <crcOk>
  CHECK: Avoid CamelCase: <batteryLow>

Signed-off-by: Valentin Vidic <Valentin.Vidic@CARNet.hr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>