ArmPkg: Remove RVCT support

RVCT is obsolete and no longer used.
Remove support for it.

Signed-off-by: Rebecca Cran <quic_rcran@quicinc.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>

ArmPkg/Include/AsmMacroExport.inc

@@ -1,23 +0,0 @@
-;%HEADER%
-;/** @file
-;  Macros to centralize the EXPORT, AREA, and definition of an assembly
-;  function.  The AREA prefix is required to put the function in its own
-;  section so that removal of unused functions in the final link is performed.
-;  This provides  equivalent functionality to the compiler's --split-sections
-;  option.
-;
-;  Copyright (c) 2015 HP Development Company, L.P.
-;
-;  SPDX-License-Identifier: BSD-2-Clause-Patent
-;
-;**/
-
-
-  MACRO
-  RVCT_ASM_EXPORT $func
-    EXPORT  $func
-    AREA s_$func, CODE, READONLY
-$func
-  MEND
-
-  END