doxygen fixes: change @var to @param var

These files were trying to document the parameters, but didn't have
the syntax quite right.  Change the comments from @varname to
@param varname as required by doxygen.

Change-Id: I63662094d3f1686e3e35b61925b580eb06e72e28
Signed-off-by: Martin Roth <martin.roth@se-eng.com>
Reviewed-on: http://review.coreboot.org/8100
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

src/soc/intel/common/hda_verb.c

@@ -139,10 +139,10 @@ static int hda_wait_for_valid(u32 base)
 /**
  * Find a specific entry within a verb table
  *
- * @verb_table_bytes:	verb table size in bytes
- * @verb_table_data:	verb table data
- * @viddid:		vendor/device to search for
- * @verb_out:		pointer to entry within table
+ * @param verb_table_bytes:	verb table size in bytes
+ * @param verb_table_data:	verb table data
+ * @param viddid:		vendor/device to search for
+ * @param verb:			pointer to entry within table
  *
  * Returns size of the entry within the verb table,
  * Returns 0 if the entry is not found

src/soc/qualcomm/ipq806x/timer.c

@@ -50,7 +50,7 @@ void init_timer(void)
 
 /**
  * udelay -  generates micro second delay.
- * @usec: delay duration in microseconds
+ * @param usec: delay duration in microseconds
  *
  * With 32KHz clock, minimum possible delay is 31.25 Micro seconds and
  * its multiples. In Rumi GPT clock is 32 KHz

src/soc/samsung/exynos5250/fb.c

@@ -114,7 +114,7 @@ static void fimd_bypass(void)
  * Initialize display controller.
  *
  * @param lcdbase	pointer to the base address of framebuffer.
- * @pd			pointer to the main panel_data structure
+ * @param pd		pointer to the main panel_data structure
  */
 void fb_init(unsigned long int fb_size, void *lcdbase,
 	     struct exynos5_fimd_panel *pd)