ArmPlatformPkg/NorFlashDxe: eliminate void pointer arithmetic
ArmPlatformPkg/NorFlashDxe: eliminate void pointer arithmetic

While most compilers happily allow arithmetic on void pointer,
the RVCT compiler does not, and throws the following warning for
NorFlashDxe:

  ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashDxe.c(894,48) :
  error  #1254-D: arithmetic on pointer to void or function type

Since the expression in question involves a cast from UINTN to VOID*,
simply add some parentheses to eliminate this warning.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <66d3c5fdaeea7ff1f996ad04f2c45e08ab38e2f5@linaro.org>
Reviewed-by: Laszlo Ersek <7437296077edea1cb64451c122c4dac071f0cfbc@redhat.com>
Reviewed-by: Ryan Harkin <26c24e1ad4aed8194be813aa696391b1ea0548f2@linaro.org>
Reviewed-by: Leif Lindholm <a613079f0455438b29e28a9c5b9eb3779a81a33a@linaro.org>

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