libsigrok: bump commit hash

Several patches fixing issues and adding new features to baylibre-acme
driver have been merged with upstream libsigrok.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libsigrok/libsigrok.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBSIGROK_VERSION = 380ee96fdfe0895ca0aa0b158d5c332ef08f8b3c
+LIBSIGROK_VERSION = 55462b8ba9f48931de9b9a7bfbc182a1d113b3b5
 # No https access on upstream git
 LIBSIGROK_SITE = git://sigrok.org/libsigrok
 LIBSIGROK_LICENSE = GPLv3+