ShellPkg/UefiShellLevel2CommandsLib: Remove unnecessary EFIAPI

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Chen A Chen <chen.a.chen@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Ruiyu Ni <Ruiyu.ni@intel.com>

ShellPkg/Library/UefiShellLevel2CommandsLib/Rm.c

@@ -29,7 +29,6 @@ STATIC CONST SHELL_PARAM_ITEM ParamList[] = {
   @retval FALSE The directory has at least 1 file or directory in it.
 **/
 BOOLEAN
-EFIAPI
 IsDirectoryEmpty (
   IN EFI_HANDLE   FileHandle
   )
@@ -66,7 +65,6 @@ IsDirectoryEmpty (
   @retval SHELL_DEVICE_ERROR  A device error occured reading this Node.
 **/
 SHELL_STATUS
-EFIAPI
 CascadeDelete(
   IN EFI_SHELL_FILE_INFO  *Node,
   IN CONST BOOLEAN        Quiet
@@ -195,7 +193,6 @@ CascadeDelete(
   @param[in] Package    RESERVED.  Not used.
 **/
 BOOLEAN
-EFIAPI
 IsValidDeleteTarget(
   IN CONST EFI_SHELL_FILE_INFO  *List,
   IN CONST EFI_SHELL_FILE_INFO  *Node,