MIPS: Alchemy: Remove dead CONFIG_SOC_AU1000_FREQUENCY

CONFIG_SOC_AU1000_FREQUENCY doesn't exist in Kconfig, therefore
removing all references for it from the source code.
Signed-off-by: NChristoph Egger <siccegge@cs.fau.de>
To: linux-mips@linux-mips.org
To: linux-kernel@vger.kernel.org
Cc: vamos@i4.informatik.uni-erlangen.de
Patchwork: https://patchwork.linux-mips.org/patch/1367/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/alchemy/common/clocks.c

@@ -89,11 +89,7 @@ unsigned long au1xxx_calc_clock(void)
 	 * over backwards trying to determine the frequency.
 	 */
 	if (au1xxx_cpu_has_pll_wo())
-#ifdef CONFIG_SOC_AU1000_FREQUENCY
-		cpu_speed = CONFIG_SOC_AU1000_FREQUENCY;
-#else
 		cpu_speed = 396000000;
-#endif
 	else
 		cpu_speed = (au_readl(SYS_CPUPLL) & 0x0000003f) * AU1000_SRC_CLK;