ArmPlatformPkg/NorFlashDxe: Remove unused debug print specifier

ArmPlatformPkg/NorFlashDxe: Remove unused debug print specifier

These debug messages are repeated in both NorFlashBlockIoReadBlocks()
and NorFlashBlockIoWriteBlocks():

  "NorFlashBlockIoWriteBlocks(MediaId=0x%x, Lba=%ld, BufferSize=0x%x"
  "bytes (%d kB), BufferPtr @ 0x%08x)\n"

Although this requires 5 arguments, only 4 are provided. The kilobyte
value was never given.

This change removes that specifier so the 4 arguments match the 4
specifiers in the debug macro.

Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com>