configure: check if process_vm_read/write is supported

CMA (cross memory attach) patch introduced 2 new syscalls:
process_vm_readv
process_vm_writev

Check in configure if these are supported.

---
 configure.ac  |    1 +
 m4/ltp-cma.m4 |   67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+)
 create mode 100644 m4/ltp-cma.m4

index 1696df0..55ee132 100644
@@ -166,5 +166,6 @@ LTP_CHECK_MADVISE
 LTP_CHECK_ACL_SUPPORT
 LTP_CHECK_FS_IOC_FLAGS
 LTP_CHECK_MREMAP_FIXED
+LTP_CHECK_SYSCALLS_CMA
 
 AC_OUTPUT

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