Replace clang-format with uncrustify

LLVM/clang is not used for any compilation due to it not supporting the
8-bit architectures we use (MCS-51, AVR). This means we are effectively
installing 250+ MiB of dependencies for a C formatting tool.

Replace it with uncrustify, which uses only ~600 KiB of space and has
more granular control of formatting (800+ options).

Signed-off-by: Tim Crawford <tcrawford@system76.com>

src/common/version.c

@@ -7,7 +7,6 @@
 #define __code
 #endif
 
-// clang-format off
 static const char __code BOARD[] =
     "76EC_BOARD="
     xstr(__BOARD__);
@@ -15,7 +14,6 @@ static const char __code BOARD[] =
 static const char __code VERSION[] =
     "76EC_VERSION="
     xstr(__FIRMWARE_VERSION__);
-// clang-format on
 
 const char *board(void) {
     return &BOARD[11];