package/opencsd: bump to version 1.5.6

For change log, see:
https://github.com/Linaro/OpenCSD/blob/v1.5.6/README.md?plain=1#L348

Signed-off-by: Julien Olivain <ju.o@free.fr>
(cherry picked from commit ae4bf5a4fedf9b2283719cf024c5f70f76e32684)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>

package/opencsd/opencsd.hash

@@ -1,3 +1,3 @@
 # Locally Computed:
-sha256  1df9b61656ac96bc5cca082d8c32a9f25ed07ef684d7d666911280cf162b7d93  opencsd-1.5.5.tar.gz
+sha256  82f584572c4e3f1d8255be135768bea80b48c4fe731cb8c5877a7389dfd445a6  opencsd-1.5.6.tar.gz
 sha256  980eef4b0744e63834e3ec0d50c2a4ff6d81d7ec62dd8ba8c66acae0ec5a2e88  LICENSE

package/opencsd/opencsd.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-OPENCSD_VERSION = 1.5.5
+OPENCSD_VERSION = 1.5.6
 OPENCSD_SITE = $(call github,Linaro,OpenCSD,v$(OPENCSD_VERSION))
 OPENCSD_LICENSE = BSD-3-Clause
 OPENCSD_LICENSE_FILES = LICENSE