MsGraphicsPkg/FrameBufferMemDrawLib: Fix function declaration mismatch

[makubacki]

Description

Fixes the following issues with GetGraphicsInfo().

1. Removes EFIAPI. This is an internal function to the library
   implementation and the explicit calling convention is not needed.
   In turn, this makes the function prototype in the C files match
   the header file.
2. Add an include guard to the local library header file.

Resolves the following GCC warning:

MsGraphicsPkg/Library/FrameBufferMemDrawLib/FrameBufferMemDrawLib.h:16:1:
warning: type of ‘GetGraphicsInfo’ does not match original declaration [-Wlto-type-mismatch]
16 | GetGraphicsInfo (
| ^

• Impacts functionality?
  • Functionality - Does the change ultimately impact how firmware functions?
  • Examples: Add a new library, publish a new PPI, update an algorithm, ...
• Impacts security?
  • Security - Does the change have a direct security impact on an application,
    flow, or firmware?
  • Examples: Crypto algorithm change, buffer overflow fix, parameter
    validation improvement, ...
• Breaking change?
  • Breaking change - Will anyone consuming this change experience a break
    in build or boot behavior?
  • Examples: Add a new library class, move a module to a different repo, call
    a function in a new library class in a pre-existing module, ...
• Includes tests?
  • Tests - Does the change include any explicit test code?
  • Examples: Unit tests, integration tests, robot tests, ...
• Includes documentation?
  • Documentation - Does the change contain explicit documentation additions
    outside direct code modifications (and comments)?
  • Examples: Update readme file, add feature readme file, link to documentation
    on an a separate Web page, ...

How This Was Tested

CI build.

Integration Instructions

N/A