media: flexcop-i2c: get rid of KERN_CONT

Coverity complains about werid stuff at the debug logic:

	CID 113542 (#1 of 1): Out-of-bounds access (ARRAY_VS_SINGLETON)10.
	callee_ptr_arith: Passing buf to function flexcop_i2c_write4
	which uses it as an array. This might corrupt or misinterpret
	adjacent memory locations.

Instead of directly addressing the issue there, let's rework at
the logic there.

On newer kernels, KERN_CONT does nothing, as the previous message
won't wait for a continuation. Also, both flexcop_i2c_read4() and
flexcop_i2c_write4(), called by it, will print stuff if (debug &4).

So, the way it is is too buggy.

There are two kinds of debug stuff there: deb_i2c() and a code hidden
under #ifdef DUMP_I2C_MESSAGES, with can't be selected without touching
the source code.

Also, if both debug & 0x4 and DUMP_I2C_MESSAGES, flexcop_i2c_request()
will emit two debug messages per call with different data,
with sounds messy.

Simplify it by getting rid of DUMP_I2C_MESSAGES and adding a new
flag to debug (0x40), and making the debug logic there more
consistent.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>