k9: Add support for Senbono K9

The K9 is similar to the PineTime and P8 devices but does not appear
to use the CST[78]16 touch screen controllers. At present the protocol
is not known (readfrom yields all zeros, readfrom_mem provokes an
exception) so we have a hugely limited interface consisting of the side
button and the touchscreen interrupts (in other words we can treat the
touchscreen like a second button).

Works suprisingly well considering...

Signed-off-by: Daniel Thompson <daniel@redfelineninja.org.uk>

1 files changed, 0 insertions, 0 deletions

diff --git a/bootloader b/bootloader
-Subproject 89ba9a874fa052ae7b0df8a9b6a6f8916309cd2
+Subproject 91fad65a8a0c5b3be0468e914a5788a519591c5