soc/sifive/fu540: Simplify UART refclk calculation

clock_get_coreclk_khz() already detects whether the PLL or the input
clock (hfclk) is used.

Tested on HiFive Unleashed.

Change-Id: I264977b0de0b81ef74a014984b6d33638ab33f4b
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/c/29334
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Hug <philipp@hug.cx>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

0 files changed, 0 insertions, 0 deletions