Run clang-format on the entire repo

This patch clang-formats the entire repo. Third-party code is
excluded.

I needed to fix up the .clang-format file so that all the header
includes are ordered properly. I could have sworn that it used to work
without the extra modification, but I guess not.

Signed-off-by: Philipp Schrader <philipp.schrader@gmail.com>
Change-Id: I64bb9f2c795401393f9dfe2fefc4f04cb36b52f6
diff --git a/motors/peripheral/spi.h b/motors/peripheral/spi.h
index 5361f91..f865703 100644
--- a/motors/peripheral/spi.h
+++ b/motors/peripheral/spi.h
@@ -2,6 +2,7 @@
 #define MOTORS_PERIPHERAL_SPI_H_
 
 #include "absl/types/span.h"
+
 #include "motors/core/kinetis.h"
 #include "motors/peripheral/uart_buffer.h"
 #include "motors/util.h"