usleep_range without a range

[Joe Perches]

scheduling can generally be better when these values are
not identical.  Perhaps these ranges should be expanded.

$ git grep -P -n "usleep_range\s*\(\s*([\w\.\>\-]+)\s*,\s*\1\s*\)"
drivers/clk/ux500/clk-sysctrl.c:45:             usleep_range(clk->enable_delay_us, clk->enable_delay_us);
drivers/cpufreq/pmac64-cpufreq.c:140:           usleep_range(1000, 1000);
drivers/cpufreq/pmac64-cpufreq.c:239:   usleep_range(10000, 10000); /* should be faster , to fix */
drivers/cpufreq/pmac64-cpufreq.c:284:           usleep_range(500, 500);
drivers/media/i2c/smiapp/smiapp-core.c:1228:    usleep_range(1000, 1000);
drivers/media/i2c/smiapp/smiapp-core.c:1235:    usleep_range(1000, 1000);
drivers/media/i2c/smiapp/smiapp-core.c:1240:    usleep_range(sleep, sleep);
drivers/media/i2c/smiapp/smiapp-core.c:1387:    usleep_range(5000, 5000);
drivers/media/i2c/smiapp/smiapp-quirk.c:205:    usleep_range(2000, 2000);
drivers/media/i2c/smiapp/smiapp-regs.c:279:             usleep_range(2000, 2000);
drivers/power/supply/ab8500_fg.c:643:   usleep_range(100, 100);
drivers/staging/rtl8192u/r819xU_phy.c:180:      usleep_range(1000, 1000);
drivers/staging/rtl8192u/r819xU_phy.c:736:                      usleep_range(1000, 1000);
drivers/staging/rtl8192u/r819xU_phy.c:740:                      usleep_range(1000, 1000);
sound/soc/codecs/ab8500-codec.c:1065:                   usleep_range(AB8500_ANC_SM_DELAY, AB8500_ANC_SM_DELAY);
sound/soc/codecs/ab8500-codec.c:1068:                   usleep_range(AB8500_ANC_SM_DELAY, AB8500_ANC_SM_DELAY);