checkpatch.pl: adjust typedef definition to QEMU coding style

Most QEMU typedefs are camelcase, starting with one uppercase letter
and containing at least one lowercase letter.  There are a few
all-uppercase types, add the most common too.

This fixes recognition of types in lines such as

    static __attribute__((unused)) inline void tcg_out8(TCGContext *s, uint8_t v)

(Example provided by Peter Maydell).
Reported-by: NAlexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: NMarkus Armbruster <armbru@redhat.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Stefan Weil <sw@weilnetz.de>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

scripts/checkpatch.pl

@@ -206,9 +206,13 @@ our $UTF8	= qr {
 	|  \xF4[\x80-\x8F][\x80-\xBF]{2}     # plane 16
 }x;
 
+# There are still some false positives, but this catches most
+# common cases.
 our $typeTypedefs = qr{(?x:
-	(?:__)?(?:u|s|be|le)(?:8|16|32|64)|
-	atomic_t
+        [A-Z][A-Z\d_]*[a-z][A-Za-z\d_]*     # camelcase
+        | [A-Z][A-Z\d_]*AIOCB               # all uppercase
+        | [A-Z][A-Z\d_]*CPU                 # all uppercase
+        | QEMUBH                            # all uppercase
 )};
 
 our $logFunctions = qr{(?x: