phy-rockchip-samsung-hdptx.c:undefined reference to `rational_best_approximation'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   fec50db7033ea478773b159e0e2efb135270e3b7
commit: 553be2830c5f33308483e8118de748a2c69fe593 phy: rockchip: Add Samsung HDMI/eDP Combo PHY driver
date:   8 weeks ago
config: sh-randconfig-002-20240409 (https://download.01.org/0day-ci/archive/20240409/202404090540.2l1TEkDF-lkp@xxxxxxxxx/config)
compiler: sh4-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240409/202404090540.2l1TEkDF-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202404090540.2l1TEkDF-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

   sh4-linux-ld: drivers/phy/rockchip/phy-rockchip-samsung-hdptx.o: in function `rk_hdptx_ropll_tmds_cmn_config':
>> phy-rockchip-samsung-hdptx.c:(.text+0x950): undefined reference to `rational_best_approximation'

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