tools: add a tool to dump the memory of hidpp20 devices

Mostly copy/paste from hidpp10-dump-page

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>

src/Makefile.am

@@ -1,5 +1,7 @@
 lib_LTLIBRARIES = libratbag.la
-noinst_LTLIBRARIES = libhidpp10.la
+noinst_LTLIBRARIES =			\
+	libhidpp10.la			\
+	libhidpp20.la
 
 include_HEADERS =			\
 	libratbag.h
@@ -52,3 +54,9 @@ libhidpp10_la_SOURCES = \
 			hidpp-generic.c	\
 			hidpp10.h	\
 			hidpp10.c
+
+libhidpp20_la_SOURCES = \
+			hidpp-generic.h	\
+			hidpp-generic.c	\
+			hidpp20.h	\
+			hidpp20.c