ENGR00255518 ipu/ipu3: using the kernel common help function div_u64

We don't need invent the wheel to implement the wrap for the _do_div,
we can use the kernel common helper function for the u64 divide with
div_u64() function call

This also fix the build break when CONFIG_DEBUG_SECTION_MISMATCH=y with
GCC4.6.3 cross-compile toolchain.

CC      init/version.o
LD      init/built-in.o
LD      .tmp_vmlinux1
drivers/built-in.o: In function `_do_div.part.1':
clkdev.c:(.text+0x15c23c): undefined reference to `__aeabi_uldivmod'
clkdev.c:(.text+0x15c25c): undefined reference to `__aeabi_uldivmod'
clkdev.c:(.text+0x15c2bc): undefined reference to `__aeabi_uldivmod'
clkdev.c:(.text+0x15c3ac): undefined reference to `__aeabi_uldivmod'
clkdev.c:(.text+0x15c3d0): undefined reference to `__aeabi_uldivmod'

This issue is caused by the wrongly optimized code produced by GCC,
See the bug report here: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48783

The similar build break issue report at:
http://lists.infradead.org/pipermail/linux-mtd/2012-May/041677.html

Signed-off-by: Jason Liu <r64343@freescale.com>

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