MAINTAINERS: Split the Alpha TCG/machine section

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20180308223946.26784-22-f4bug@amsat.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

MAINTAINERS

@@ -127,7 +127,6 @@ Alpha
 M: Richard Henderson <rth@twiddle.net>
 S: Maintained
 F: target/alpha/
-F: hw/alpha/
 F: tests/tcg/alpha/
 F: disas/alpha.c
 
@@ -413,6 +412,11 @@ F: include/*/*win32*
 X: qga/*win32*
 F: qemu.nsi
 
+Alpha Machines
+M: Richard Henderson <rth@twiddle.net>
+S: Maintained
+F: hw/alpha/
+
 ARM Machines
 ------------
 Allwinner-a10