tape: remove MediumType struct, which is only valid on IBM drives

HP drives do not return this information.

Note: This breaks format on WORM media, because we have not way
to detect WOREM media (how?).

src/tools/sgutils2.rs

@@ -219,38 +219,6 @@ pub struct InquiryInfo {
     pub revision: String,
 }
 
-#[repr(u8)]
-pub enum MediumType {
-    /// Unknown (no media loaded)
-    Unknown = 0x00,
-    Ultrium1Data = 0x18,
-    Ultrium2Data = 0x28,
-    Ultrium3Data = 0x38,
-    Ultrium3Worm = 0x3C,
-    Ultrium4Data = 0x48,
-    Ultrium4Worm = 0x4C,
-    Ultrium5Data = 0x58,
-    Ultrium5Worm = 0x5C,
-    Ultrium6Data = 0x68,
-    Ultrium6Worm = 0x6C,
-    Ultrium7Data = 0x78,
-    Ultrium7Worm = 0x7C,
-    Ultrium8Data = 0x88,
-    Ultrium8Worm = 0x8C,
-}
-
-impl MediumType {
-
-    pub fn is_lto5_or_newer(medium_type: u8) -> bool {
-        medium_type >= Self::Ultrium5Data as u8
-    }
-
-    pub fn is_worm(medium_type: u8) -> bool {
-        (medium_type & 0x0F) == 0x0C
-    }
-
-}
-
 #[repr(C, packed)]
 #[derive(Endian, Debug, Copy, Clone)]
 pub struct ModeParameterHeader {