add fan curve support parity with Linux daemon

fan curves and model strings current as-of:
  https://github.com/pop-os/system76-power/blob/79b02d/src/fan.rs

bump to rust 1.53 (or newer is OK)

This is due to the use of "or patterns" inside a match. This was
stabilized in rust 1.53: rust-lang/rust#79278

I see similar syntax used in the Linux daemon, but that uses rust
1.41... I'm uncertain how that was building previously?

rust-toolchain

@@ -1 +1 @@
-1.50.0
+1.53.0

src/main.rs

@@ -90,6 +90,19 @@ fn driver() -> io::Result<()> {
             debug!("{} {} uses standard fan curve", sys_vendor, product_version);
             FanCurve::standard()
         },
+        ("System76", "thelio-major-r1") => {
+            debug!("{} {} uses threadripper2 fan curve", sys_vendor, product_version);
+            FanCurve::threadripper2()
+        },
+        ("System76", "thelio-major-r2" | "thelio-major-r2.1" | "thelio-major-b1" | "thelio-major-b2"
+                   | "thelio-major-b3" | "thelio-mega-r1" | "thelio-mega-r1.1" ) => {
+            debug!("{} {} uses hedt fan curve", sys_vendor, product_version);
+            FanCurve::hedt()
+        },
+        ("System76", "thelio-massive-b1") => {
+            debug!("{} {} uses xeon fan curve", sys_vendor, product_version);
+            FanCurve::xeon()
+        },
         _ => return Err(io::Error::new(
             io::ErrorKind::Other,
             format!(