Add silead fw for GPD Q9

firmware/gpd/q9/README.md

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+GPD Q9
+
+---------------------------------------------
+
+| Item                      | Description |
+|---------------------------|-------------|
+| Manufacturer              | GPD       |
+| Device                    | XD  |
+| Extracted firmware        |  [silead_ts.fw](silead_ts.fw) |
+| Display resolution        | 1024x600 |
+| Touch panel resolution    | 1024x600 |
+| Touch controller          | GSL1680 |
+| Multitouch support        | Yes (5 points) |
+| Finger tracking           | Yes |
+| Mirrored horizontally     | Yes |
+| Mirrored vertically       | Yes |
+| Axes swapped              | No |
+| Comments | Extracted from live ROM, cf logs.txt |
+

firmware/gpd/q9/logs.txt

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+# cat /proc/kallsyms |grep -i fw |grep -i gs                   
+c04dd1c4 t gsl_load_fw
+c0878bd4 r GSLX680_FW
+
+root@rk3288:/ # cat /proc/kallsyms |grep GSLX680_FW -C1                        
+c0878bc4 r __func__.19799
+c0878bd4 r GSLX680_FW
+c0882dbc r __func__.20394
+
+dd if=/dev/mem of=/data/local/tmp/fw bs=1 skip=$((0x0878bd4) count=$((0xc0882dbc-0xc0878bd4))