lib: Move mem operations functions to one src file

Move all mem operations functions into a single
source code file, instead of the various source
code files that just implement a single or few
funtion.

No functional change.

Signed-off-by: Kaige Fu <kaige.fu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

Author: KaigeFu

hypervisor/Makefile

@@ -119,13 +119,10 @@ C_SRCS += arch/x86/guest/ucode.c
 C_SRCS += arch/x86/guest/pm.c
 C_SRCS += lib/spinlock.c
 C_SRCS += lib/udelay.c
-C_SRCS += lib/memchr.c
-C_SRCS += lib/memcpy.c
 C_SRCS += lib/mdelay.c
 C_SRCS += lib/div.c
 C_SRCS += lib/string.c
-C_SRCS += lib/memset.c
-C_SRCS += lib/mem_mgt.c
+C_SRCS += lib/memory.c
 C_SRCS += lib/crypto/tinycrypt/hmac.c
 C_SRCS += lib/crypto/tinycrypt/sha256.c
 C_SRCS += lib/crypto/hkdf.c