cpupower-frequency-info.1: document --boost and --epp options

cpupower-frequency-info.1: document --boost and --epp options

`cpupower frequency-info` supports the '--boost' option since the program
was first added with commit 7fe2f6399a84 ("cpupowerutils - cpufrequtils
extended with quite some features"), but the man page lacks it.

'--epp' has been added with commit 5f567afc283f ("cpupower: Add support for
showing energy performance preference") but it has never been added to the
man page.

cpufreq-info.c:
	{"boost",	 no_argument,		 NULL,	 'b'},
	...
	{"epp",		 no_argument,		 NULL,	 'z'},

Signed-off-by: Roberto Ricci <io@r-ricci.it>
Link: https://lore.kernel.org/r/20260324223921.14317-4-io@r-ricci.it
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>