fastboot: Fix missing endian header in fastboot_driver.h to avoid header confusion

So fastboot_driver.h includes <android-base/logging.h>, but that
file has a dependency on <android-base/endian.h>. So if
fastboot_driver.h gets included somewhere before
<android-base/endian.h>, it results in *very* opaque error
message:

system/core/fastboot/fastboot.cpp:1490:9: error: expected unqualified-id
        LOG(VERBOSE) << "Cannot optimize flashing super on non-AB device";
        ^
system/libbase/include/android-base/logging.h:221:23: note: expanded from macro 'LOG'
                      ^
system/libbase/include/android-base/logging.h:227:4: note: expanded from macro 'LOGGING_PREAMBLE'
  (WOULD_LOG(severity) &&                                                                  \
   ^
system/libbase/include/android-base/logging.h:202:40: note: expanded from macro 'WOULD_LOG'
  (UNLIKELY(::android::base::ShouldLog(SEVERITY_LAMBDA(severity), _LOG_TAG_INTERNAL)) || \
                                       ^
system/libbase/include/android-base/logging.h:174:26: note: expanded from macro 'SEVERITY_LAMBDA'
  using ::android::base::ERROR;               \
                         ^
prebuilts/gcc/linux-x86/host/x86_64-w64-mingw32-4.8/x86_64-w64-mingw32/include/wingdi.h:75:15: note: expanded from macro 'ERROR'
              ^

This patch includes <android-base/endian.h> before
<android-base/logging.h> to avoid this issue.

Reported-by: Daniel Zheng <zhengdaniel@google.com>
Signed-off-by: John Stultz <jstultz@google.com>
Change-Id: I8752f2cdbef5b13901f0f4e8adfe60a21db785b6