fixup! fixup! [mlir][ArmSME] Split the Op definition (nfc)

* Revert the removal of `arm_sme` namespace qualifier
* Rename `ArmSME.td` as `ArmOpsSME.td` (file defining regular Ops)
* Rename `ArmSMEBase.td` as `ArmSME.td` (main dialect file)
* Fix typos

Author: banach-space

mlir/include/mlir/Dialect/ArmSME/IR/ArmSME.h

@@ -29,7 +29,7 @@
 #include "mlir/Dialect/ArmSME/IR/ArmSMEDialect.h.inc"
 
 #define GET_OP_CLASSES
-#include "mlir/Dialect/ArmSME/IR/ArmSME.h.inc"
+#include "mlir/Dialect/ArmSME/IR/ArmSMEOps.h.inc"
 
 #define GET_OP_CLASSES
 #include "mlir/Dialect/ArmSME/IR/ArmSMEIntrinsicOps.h.inc"