EmbeddedPkg/AndroidFastboot: eliminate deprecated string function calls

Get rid of calls to unsafe string functions. These are deprecated and may
be removed in the future.

Note that this also addresses a latent potential issue in HandleDownload(),
where NumBytesString[] (which comes from the wire) is assumed to contain a
string representation of a number with all the significant digits in the
first 8 bytes, which is not guaranteed by the protocol.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

EmbeddedPkg/Application/AndroidFastboot/AndroidBootImg.c

@@ -84,7 +84,8 @@ ParseAndroidBootImg (
                  + ALIGN_VALUE (Header->KernelSize, Header->PageSize));
   }
 
-  AsciiStrnCpy (KernelArgs, Header->KernelArgs, BOOTIMG_KERNEL_ARGS_SIZE);
+  AsciiStrnCpyS (KernelArgs, BOOTIMG_KERNEL_ARGS_SIZE, Header->KernelArgs,
+    BOOTIMG_KERNEL_ARGS_SIZE);
 
   return EFI_SUCCESS;
 }