spmp: add CSRs and related field masks

reference:
  https://github.com/riscv/riscv-spmp/releases/tag/v0.8.18
  riscv/riscv-spmp#74 (comment)

Signed-off-by: Chih-Min Chao <chihmin.chao@sifive.com>

Author: chihminchao

csrs.csv

@@ -72,6 +72,7 @@
 0x15F, "sctrdepth"
 0x180, "satp"
 0x181, "srmcfg"
+0x183, "spmpen"
 0x5A8, "scontext"
 0x200, "vsstatus"
 0x204, "vsie"
@@ -129,6 +130,7 @@
 0x148, "sscratchcsw"
 0x149, "sscratchcswl"
 0x307, "mtvt"
+0x316, "mpmpdeleg"
 0x345, "mnxti"
 0x346, "mintstatus"
 0x348, "mscratchcsw"

csrs32.csv

@@ -1,6 +1,7 @@
 0x114, "sieh"
 0x154, "siph"
 0x15D, "stimecmph"
+0x193, "spmpenh"
 0x214, "vsieh"
 0x254, "vsiph"
 0x25D, "vstimecmph"

encoding.h

@@ -382,6 +382,8 @@
 #define PMP_NA4   _RISCV_UL(0x10)
 #define PMP_NAPOT _RISCV_UL(0x18)
 
+#define MPMPDELEG_PMPNUM _RISCV_UL(0x7F)
+
 #define SPMP_U      _RISCV_UL(0x100)
 #define SPMP_SHARED _RISCV_UL(0x200)