target/riscv/cpu.c: fix Zvkb extension config

This code has a typo that writes zvkb to zvkg, causing users can't
enable zvkb through the config. This patch gets this fixed.

Signed-off-by: Yangyu Chen <[email protected]>
Fixes: ea61ef7 ("target/riscv: Move vector crypto extensions to riscv_cpu_extensions")
Reviewed-by: LIU Zhiwei <[email protected]>
Reviewed-by: Alistair Francis <[email protected]>
Reviewed-by: Max Chou <[email protected]>
Reviewed-by:  Weiwei Li <[email protected]>
Message-ID: <[email protected]>
Cc: qemu-stable <[email protected]>
Signed-off-by: Alistair Francis <[email protected]>
(cherry picked from commit ff33b7a)
Signed-off-by: Michael Tokarev <[email protected]>

Author: cyyself

target/riscv/cpu.c

@@ -1535,7 +1535,7 @@ const RISCVCPUMultiExtConfig riscv_cpu_extensions[] = {
     /* Vector cryptography extensions */
     MULTI_EXT_CFG_BOOL("zvbb", ext_zvbb, false),
     MULTI_EXT_CFG_BOOL("zvbc", ext_zvbc, false),
-    MULTI_EXT_CFG_BOOL("zvkb", ext_zvkg, false),
+    MULTI_EXT_CFG_BOOL("zvkb", ext_zvkb, false),
     MULTI_EXT_CFG_BOOL("zvkg", ext_zvkg, false),
     MULTI_EXT_CFG_BOOL("zvkned", ext_zvkned, false),
     MULTI_EXT_CFG_BOOL("zvknha", ext_zvknha, false),