platform: fix read_from_file function

According to the description of "read_from_file", the function should
return a line from file when this line starts with 'match' string,
provided as an argument. But the current implementation does not follow
this description - it compares a full line (not only beginning) with the
'match' string. As a result, a desired result (line) will be returned by
the function only if a line is equal to the 'match' string.

To make the function work according to the description, replace strcmp
with strncmp.

Also remove tabulation from eol symbols to return a full line.

Signed-off-by: Dmitry Petrov <dmitry.petrov@rtsoft.de>