libhyp: Make MmioGuardNotsupported UpperCamelCase

Trivial change to make the variant name compliant with the naming
convention.

Test: -
Change-Id: I26b06db0f49b193674cd9cd1bc6cdc5b37a32313
diff --git a/libs/hyp/src/error.rs b/libs/hyp/src/error.rs
index b8498ca..3fdad70 100644
--- a/libs/hyp/src/error.rs
+++ b/libs/hyp/src/error.rs
@@ -26,7 +26,7 @@
 #[derive(Debug, Clone)]
 pub enum Error {
     /// MMIO guard is not supported.
-    MmioGuardNotsupported,
+    MmioGuardNotSupported,
     /// Failed to invoke a certain KVM HVC function.
     KvmError(KvmError, u32),
     /// Failed to invoke GenieZone HVC function.
@@ -40,7 +40,7 @@
 impl fmt::Display for Error {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match self {
-            Self::MmioGuardNotsupported => write!(f, "MMIO guard is not supported"),
+            Self::MmioGuardNotSupported => write!(f, "MMIO guard is not supported"),
             Self::KvmError(e, function_id) => {
                 write!(f, "Failed to invoke the HVC function with function ID {function_id}: {e}")
             }